You should not have intercourse until you have had a normal period for at least one month after the miscarriage. After miscarriage, women’s body resistance is weak and the vaginal bleeding is accompanied by a decrease in the content of the dominant bacterium, Lactobacillus, in the vagina, so the vagina itself is less able to clean itself. The blood is a culture medium for bacteria, which can easily breed, and intercourse at this time can lead to the invasion of exogenous pathogens, which can cause vaginal inflammation. Exogenous pathogens may travel through the bloodstream, through the open cervical opening to the uterine cavity, or even through the fallopian tubes or lymphatic system to the abdominal cavity, which may manifest as pelvic inflammatory disease. Therefore, sexual intercourse is not allowed within one month after abortion.